Locknut
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SPIETH LOCKNUTS 4 UNIQUE FEATURES - NUMEROUS BENEFITS The locking system enables the application of high clamping forces to ensure that the nut is friction-locked onto the spindle thread. The load is applied to the thread across 3600 sym- metrically and evenly. The locking force and working load act in the same direction and cannot cancel each other out. This is the re- quirement for the highest locking effect while at the same time preserving the connecting The locking procedure is designed to exert a self-centring effect for the nut on the spindle thread. This is the prerequisite for...

Spieth locknuts are precision nuts fitted with an integrated premium thread lock. They are used in all areas of mechanical engi- neering. Precision, safety, rigidity and ease of use are key aspects in the design of a threaded connection. Spieth nuts are the first choice whenever at least one of these aspects is re- APPLICATION EXAMPLES cutting machine tools. automation equipment. • In general drive engineering and • In printing presses and paper-making • In process engineering applications for mixing, crushing and centrifuging. • For metrology, control and test engineering.

FUNCTIONAL PRINCIPLE In this example, based on a type MSF locknut. The principle is illustrated in a simplified dia- gram with enlarged thread flank play. As with every threaded connection, there is a degree of mating play when the nuts are screwed on. As a result, the nut may be aligned with a parallel and/or angled axial offset rela- tive to the spindle axis; in other words, the 2. Spieth locknuts: Self-centring and self- aligning thanks to play restriction Unique: Spieth locknuts are automatically self-centring and eliminate mating play (thread flank play) as far as possible. Thanks to...

ASSEMBLY EXAMPLES Example 1: Tapered roller bearing In tapered roller bearings, run-out accuracy, a high level of axial rigidity and dynamic safety create a major contribution to perfect bearing operation: Radial stress applied to the tapered roller bearing generates axial forces (axial ri- gidity). Due to a lack of axial pretension (no axial friction), the intrinsic safety of the lock- Example 2: Ball roller spindle The use of a locknut gives the bearing of the ball roller spindle a high degree of axial rigid- ity. Under highly dynamic operating condi- tions, the high degree of dynamic...

ASSEMBLY EXAMPLES Example 4: Main spindle bearing The locknut ensures a high level of axial rigid- ity and excellent concentricity on the main spindle bearing in a turning lathe. Example 5: Round axis Not a millimetre is lost in the axial direction and, despite this, there is no need to sacrifice run-out accuracy, axial rigidity or a high de- gree of dynamic safety. Example 6: Table structure Due to the flat design, countersunk installa- tion is possible without causing any interfer- ing contours in the table surface. Straining of the structure due to a tilting locknut caused by thread...

ASSEMBLY EXAMPLES Example 7: Tooling spindle The low installation height of the MSF locknut makes it possible to create a compact drive side of the spindle. This configuration saves valuable installation space and minimises de- structive rotating bending stress. At the same time, the benefits of a Spieth high-precision locknut are fully exploited. Example 8: Feed drive system The installation using a locknut reliably trans- mits the high load-bearing capacity and axial rigidity of the needle axial cylindrical bearing to the feed drive system. The excellent locking properties provided by the...

SPIETH LOCKNUTS: THE RIGHT CHOICE We'll provide you with the perfect locknuts for your application. We'll also help you choose the right one - with expert advice from our Series AASR - MSA, AASF and MSW • Excellent axial rigidity and loading capacity under high levels of dynamic stress. • Simple connecting components, no grooves, • Axial position of the contact surface can be easily and precisely adjusted. • Even in the installed state, exact run-out accuracy, which can be further improved with adjustment. Reduced contact cases with reduced outer diameter

SPIETH LOCKNUTS SERIES MSR The admissible operating loads specified in the table are guideline values calculated with • under static stress relative to the minimum yield point, • under dynamic stress relative to the mini- Clamping screws Calcu- Calcula- Perm, axial Moment lation tion stress of No. factor factor | inertia

11 The number of holes corresponds to the number of clamping screws.

SPIETH LOCKNUTS SERIES MSR 1!The number of holes corresponds to the number of clamping screws. The admissible operating loads specified in the table are guideline values calculated with a safety factor of 1.6 under static stress relative to the minimum yield point.

SPIETH LOCKNUTS SERIES MSA 11 The number of holes cor res ponds to the number of clamping screws. The MSA series locknuts with reduced contact surface and in some cases smaller outside diameters relative to the MSR series are particularly suited for mounting angular ball bearings and cylinder roller bearings of ISO diameter series 9. The admissible operating loads specified in the table are guideline values calculated with a safety factor of 1.6 • under static stress relative to the minimum yield point, • under dynamic stress relative to the minimum alternate strength.

SPIETH LOCKNUTS SERIES MSF For applications with limited installation space. Clamping screws cheese head clamping screws 11 The number of holes cor res ponds to the number of clamping screws. The admissible operating loads specified in the table are guideline values calculated with a safety factor of 1.6 under static stress relative to the minimum yield point.

SPIETH LOCKNUTS SERIES MSW 11 The number of grooves for hook spanner DIN 1810-A corresponds to the number of clamping screws. Perm, axial

Lock screws 21 Manufacturer's max. permissible tightening torque. The admissible operating loads specified in the table are guideline values calculated with a safety factor of 1.6 • under static stress relative to the minimum yield point, • under dynamic stress relative to the minimum alternate strength.